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insights: flush cache when transaction statistics disabled
A memory leak was found where disabling the cluster setting `sql.metrics.transaction_details.enabled` prevented the insights cache from flushing statements. A previous patch fixed this partially by preventing further statement & transactions from being recorded to the insights system when the cluster setting was disabled. This patch implements the other piece of the memory leak fix, which is flushing the insights caches when `sql.metrics.transaction_details.enabled` is disabled. It adds an onChange listener to the setting, which triggers a new `CacheClearer` interface implementation that handles the cache clearing. Fixes: #117300 Release note: none
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